#box {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    margin-top: 50px;
}
#box input{
    border: gainsboro solid 1px;
    width: 200px;
    height: 30px;
}
#box button{
width: 140px;
    height: 30px;
    background-color: #10b618;
    color: #fff;
    border: none;
    border-radius: 5px;
    margin-top: 15px;
    cursor: pointer;
}
h1{
    display: flex;
    align-items: center;
    justify-content: center;
}